American Fuzzy Lop is described as 'American fuzzy lop is a security-oriented fuzzer that employs a novel type of compile-time instrumentation and genetic algorithms to automatically discover clean, interesting test cases that trigger new internal states in the targeted binary' and is an app in the development category. There are 2 alternatives to American Fuzzy Lop for Linux, BSD, OpenSolaris and Mac. The best American Fuzzy Lop alternative is Domato, which is both free and Open Source.
Like most DOM fuzzers, Domato is generative, meaning that the fuzzer generates a sample from scratch given a set of grammars that describes HTML/CSS structure as well as various JavaScript objects, properties and functions.
zzuf is a transparent application input fuzzer. Its purpose is to find bugs in applications by corrupting their user-contributed data (which more than often comes from untrusted sources on the Internet).